US stocks drifted higher to more records on a holiday-shortened day of trading. The S&P 500 rose 0.3%. The Dow Jones Industrial Average climbed 0.6%, and the Nasdaq composite edged up 0.2%. Markets closed early for Christmas Eve and will remain closed for Christmas Thursday. The S&P 500 is up more than 17% this year, driven by optimism about artificial intelligence and deregulatory policies. Investors' focus is on the U.S. economy's direction and Federal Reserve interest rate policy. Unemployment claims fell last week, indicating a still-healthy labor market. Dynavax Technologies soared after French pharmaceutical company Sanofi said it would buy the vaccine maker.
